Mitsubishi FR-E540-0.4K-EC Instruction Manual page 185

(3) Warnings
Operation Panel Indication
Name
Description
Check point
Corrective action
Note:5 The stall prevention operation current can be set as desired. It is factory-set to
150%.
OL
Stall prevention (over current)
During If a current of more than 150% (Note 5) of
acceleration the rated inverter current flows in the
motor, this function stops the increase in
frequency
reduces to prevent the inverter from
resulting in over current shut-off. When the
overload current has reduced below 150%,
this function increases the frequency
again.
During If a current of more than 150% (Note 5) of
constant-speed the rated inverter current flows in the
operation motor, this function lowers the frequency
until the overload current reduces to
prevent overcurrent shut-off. When the
overload current has reduced below 150%,
this function increases the frequency up to
the set value.
During If a current of more than 150% (Note 5) of
deceleration the rated inverter current flows in the
motor, this function stops the decrease in
frequency
reduces to prevent the inverter from
resulting in overcurrent shut-off. When the
overload current has reduced below 150%,
this function decreases the frequency
again.
Check the motor for use under overload.
The acceleration/deceleration time may change.
Increase the stall prevention operation level with Pr. 22 "stall
prevention operation level", or disable stall prevention with
Pr. 156 "stall prevention operation selection".
169
PROTECTIVE FUNCTIONS
FR-PU04 OL
until the overload
until the overload
current
current